<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="root"></div>
</body>
</html>
<script src="https://unpkg.com/vue@next"></script>
<script>
    const app = Vue.createApp({
        data(){
            return{
                num:123,
            }  
        },
        template:`
        <div>
            <test :content="num" />
        </div>
        `
    });
    // test : string boolean array object function symbol
    // required 必填
    // default 默认值
    app.component('test',{
        props:{
            content:{
                type:Number,
                validator:function(value){
                    return value<1000;
                },
                // required:true,
                default:function(){
                    return 456;
                }
            }
        },
        template:`<div>{{content}}</div>`
    })
    const vm = app.mount('#root')
</script>